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Is the leg extension machine bad for knees?

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wayne91
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2014/12/15 18:46:18 (permalink)
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Is the leg extension machine bad for knees?

Hey guys.
 
What is your opinions on the leg extension machine for quadriceps?
In this video: https://www.youtube.com/watch?v=YyvSfVjQeL0 the guy's knees
are in line with the pivot point of the machine. When I saw my physio today he told me
that everyones legs are different sizes so I shouldn't be worried about having my knees
aligned with the pivot point of the machine. He instead said the way I would be able to tell 
that my leg positioning was correct was if I had enough space to fit 2 fingers behind my kneecaps
when I was sitting down? If I could do this, then my legs are in perfect positioning to do the leg extensions
according to him with minimal knee pressure involved
 
Any help would be awesome. 
Cheers.
#1

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    dirtyvest
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    Re: Is the leg extension machine bad for knees? 2014/12/15 19:02:57 (permalink)
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    2 fingers behind your kneecaps or 2 fingers behind the back of your knee?
     
    Leg extensions are not inherantly bad for your knes tho... in fact you often see them being done in rehab work.
     
    However, I don't see why he would say not to worry about being in line with the pivot point, surely you want the joint that is extending to be in line with the point where the machine does the same thing

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    #2
    gavin882
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    Re: Is the leg extension machine bad for knees? 2014/12/15 19:04:33 (permalink)
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    Ive read in a mag which ill try and find that its not the best for your knees but then again all leg exercises can put a lot of pressure on the kness
    #3
    newcastle
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    Re: Is the leg extension machine bad for knees? 2014/12/15 19:16:05 (permalink)
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    gavin882
    Ive read in a mag which ill try and find that its not the best for your knees but then again all leg exercises can put a lot of pressure on the kness


    Here lies the problem. All of them do, very little you can do about it in reality.
    #4
    Floydy
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    Re: Is the leg extension machine bad for knees? 2014/12/15 20:27:34 (permalink)
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    I find them fine if I don't lock out the knees fully straight. Enough to feel the top part of the thighs muscle up only. Virtually 97-98% straight.
    #5
    Medic
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    Re: Is the leg extension machine bad for knees? 2014/12/15 21:08:50 (permalink)
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    I am stuck doing knee extensions until my SI joint relaxes. I miss squats and deads.
    #6
    JimRat
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    Re: Is the leg extension machine bad for knees? 2014/12/15 21:18:17 (permalink)
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    The sad irony is that when he demonstrates holding and pulling on the handles to keep his butt down, its actually comes up more!
     
    I don't this exercise is specifically 'bad' for your knees. It will preferentially load your quads more which is very useful for rehab of certain knee problems. 
    #7
    WhiteSnake
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    Re: Is the leg extension machine bad for knees? 2014/12/16 08:37:33 (permalink)
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    I wouldn't worry too much about it.
    It's knee extension via a machine. If you can't do this action you might as well leave the gym lol.
     
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    #8
    TheThumper
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    Re: Is the leg extension machine bad for knees? 2014/12/16 09:14:06 (permalink)
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    The only issue may be that the exercise is open chain, but is effectively fixed where the front of your ankles are in contact with the pad. Knee extension through most people's natural range of motion will involve some rotation and you won't be able to perform this during leg extension, whereas you would be able to in a movement like a squat or step ups/downs, etc.

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    Celt
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    Re: Is the leg extension machine bad for knees? 2014/12/16 09:39:17 (permalink)
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    I'm just not a fan of the leg extension nor the hamstring curl machines tbh. Neither have ever felt like a natural movement across a range of machine brands. Much prefer squat and dead variations, lunge variations, and plyometric jumps for leg day.
     
    Agree with the above though, some stress on the knee is inevitable if you're training legs.
    #10
    wayne91
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    Re: Is the leg extension machine bad for knees? 2014/12/16 17:54:45 (permalink)
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    Cool thanks heaps guys.
    Yeah I guess at the end of the day: lunges, squats, etc are all going to put some form of pressure on the knees. I guess that's the price we all have to pay for wanting strong legs. And Dirtyvest yup he told me to make sure I can fit 2 fingers behind the back of my knees. The funny thing is, when I have my knees further past the pivot point, I feel it more in my quads and less in my knees. I don't know why, but when I sit further there is less strain on my knees. I guess I'll do that then.
    #11
    Blub2abs
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    Re: Is the leg extension machine bad for knees? 2014/12/16 20:56:04 (permalink)
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    I suppose the question should be - if knee strain is inevitable, what else should we be doing to mitigate the ill-effects in addition to:

    1) Good form;
    2) Thorough stretching;
    3) Knee-wraps?
    #12
    flick161
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    Re: Is the leg extension machine bad for knees? 2014/12/17 08:58:53 (permalink)
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    When I learnt to PT we also learnt to fit 2 fingers behind the knee for a more comfortable movement.
    The Leg extension can cause pain to knees, but, likewise, the Squat can do the same thing if you don't have sound technique 
    Practice good form, and do it unless you have knee problems IMHO 
    #13
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